I see what you mean now. Well.. maybe he just fell into an influencer's spiel and ended up doing something that everyone else is doing. That's a pretty common thing in the world nowadays. People simply don't like being challenged and admit they're wrong about things, and that's entirely normal for better or worse.
It sounds to me like that person just wanted to be right and agree with what the Youtube video said. Even if a bunch of people were to tell them what the fuck was wrong, he'd still bunker down and call them all names rather than argue and accept he was wrong. It sucks that a game from a genre you like didn't come to pass, but maybe the dev just wasn't enjoying what he was making and a Binding clone is something he likes to do best. My own game was going to be a Zelda-like ARPG before I gave up on finding assets for it and settled with a platformer, which then also went through a cycle of rebuilding from scratch. Devs do what devs think it's best, and sometimes the world agrees. Sometimes, it doesn't.